Telephone-switch



(No Modem- IA.. S-IROMBERG 8u A.' GARLSON.

TELEPHONE SWITCH. y No.V 516,777. Patentealvfar, 20, 1894.

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- a L7M @y ff UNITED STATES PATENT j Ormes.

ALFRED STROMBERG AND ANDROV CARLSON, OF CHICAGO, ILLINOIS.

TELEPHONE-SWITCH.

SPECIFICATION forming part of Letters Patent No. 516,777, dated March 20, 1894.

l Application led September 2l, 1893. Serial No. 486.078. (No model.)

To @ZZ whom t may concern:

Be it known that we, ALFRED STROMBERG and ANDRov CARLSON, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Telephone-Switches, (Case No. 10,) of which the following is afull, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this speciiication.

Our invention relates to telephone switches, and is designed especially for use at subscribers stations to enable the subscriber to bring the telephone receiver automatically into circuit on taking down the receiver, and to close the circuit through the local alarm bell and magneto generator when the' receiver is, returned to its supporting hook. The gravity switch has been most generally used for this purpose, a spring being employed having sufficient resiliency to overcome the weight of the switch lever when the telephone receiver was removed therefrom, whereby the receiver was switched into circuit, while the weight of the receiver when hung upon the switch hook was sufficient to overcome theresistanceof the opposingspring, therebyswitching the receiver out of circuit, and closing the circuit through the magneto generator and local alarm,

Our invention has for its object the construction of a telephone switch wherein the parts are simple and conveniently arranged, and wherein the making and breaking of the talking and ringing circuit is positive, and does not depend upon a lack of balance between the weight of the telephone and the tension of a spring.

One form of our improved telephone switch lnay be generally described as consisting of a telephone hook provided with a short stem, to which is secured a spring mounted upon the interior of the telephone box, the spring being mounted in such a position as to be capable of movement in a horizontal plane. The telephone hook and a portion of its stem is without the telephone box, a horizontal slot being cut in said box to permit of the horizontal excursion of the switch lever. A

bracket is mounted upon the telephone box,

wall c of the telephone box.

one edge of which bracket is between the two members of the telephone hook when the receiver is removed, and contacts are provided to be operated by the lever whereby the local alarm and generator circuitis broken and the telephone receiver is switched into circuit. When the receiver is placed upon the hook it is inserted between the aforesaid bracket and one of the limbs of the telephone hook, whereby the telephone switch is shifted to such an extent as to cut`the telephone receiver out of circuit and to close circuit through the local alarm and generator.

Our invention will be more 'readily understood by reference to the accompanying drawings, in which;

vFigure 1 is a plan view of our improved form of switch, with a portion of-the telephone box shown in section. Fig. 2'is a side elevation thereof. Fig. 3 is a plan view of a modification of our improved form of switch with the telephone shown in place upon its hook. v

Referring to Figs.1 and 2 the telephone hook a is provided with a stem b secured to repellent spring c which is mounted upon A horizontal slot d is provided in the telephone box to permit of the horizontal excursion of the switch. A shelf orbracket eis mounted upon the telephone box and occupies the position shown in Fig. 1 with relation to the telephone hook when the receiver is removed, and as shown in Fig. 3 when the receiver is returned to its support. Contact points f g are mounted upon supports he' mounted upon insulating blocks or directly. upon the telephone box. The spring cis of such strength and resiliency that when the telephone is removed from its hook the spring will rest against contact point f, as shown in Fig. 1.

On placing the telephone receiver upon its hook it is interposed between the bracket e and limb a of telephone hook a, whereby the hook is shifted laterally, when electrical connection between contact point f and spring c is broken and contact made between spring c and contact point g, the edge of t-he bracket which opposes the telephone receiver being suitably curved to permit of the easy access of the receiver to its hook. The space be- IOO tween the limb a of the telephone hook a and the nearest edge of the bracket being such that firm and positive cont-act is made between the spring cand contact point g each time the receiver is hung in place.

rIhe telephone line may be permanently connected to spring c and when the telephone is on its supporting hook will be closed through the bell and magneto generator contact g. On removing the telephone the spring c, being of proper resiliency, will release itself from contact with point g and make coutact with pointf, thereby cutting out of circuit the local alarm bell and magneto generator, and switching the telephone into circuit. The contact points f g are, as said, preferably fixed, and all contacts are made by the single fiat spring c moved alternatively from the connection on one side to the connection on the opposite side.

In Fig. 3 we have shown a modification of our improved form oftelephone switch. The stem of the telephone hook is preferably longer than that shown in Figs. 1 and 2, and is pivotally supported ath upon a bracket t', a repellent spring lo is employed to shift the switch lever when the receiver is removed from its hook. Contact points Z fm having the same oiiices as contact points f g, respectively, are mounted upon contact supports n o. A contact spring p is secured to the end of the stem of the telephone hook. The contact points n o are preferably fixed, and all contacts are made by the spring p moved alternatively from the connection on one side to the connection on the opposite side. The repellent spring 7c is employed to cause contact spring p to complete connection with contact Z when the receiver is re moved.

To make the hook tixed in position and mount the bracket or support upon a pivot whereby it may be shifted would obviously fall within the spirit of ourinvention, and we consider such a construction as within the purview of the appended claims.

We do not desire to confine ourselves to the precise construction shown; but,

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

l. The combination with a horizontally shifting telephone hook yieldingly maintained at one end of its travel, of a bracket one edge thereof occupying a position between the members of said hook; whereby the insertion of the telephone receiver between said edge and the outer member of said hook may impart to the hook. a transverse movement; substantially as described.

2. The combination with a horizontally shifting telephone hook yieldingly main-` tained at one end of its travel, of a bracket, one edge thereof occupying a position between the members of said hook,and contact points controlled by said telephone hook; substantially as described.

In witness whereof we hereunto subscribe our names this 14th day of September, A. D. 1893.

ALFRED sTRoMBERG. m ANDROV CARLSON. Witnesses:

GEORGE D. ORAGG, GEORGE S. BUELL. 

